Material Selection

Hello Everyone:

Would you kindly please help me with this?

I want to know the steps toward creating P.M.S (Especially, selecting the materials and wall thickness calculation) in projects.
For creating the P.M.S for a project we usually use the previous experiences or sometimes the client asks us to use their P.M.S as a base.
As I know the following steps should be taken for selecting the materials and calculating the wall thickness:
1- Generating the PFD from Process Dep.
2- Generating the Material Selection Diagram by Material & Welding Dep.
3-Calculating the Corrosion rate.

4-Calculating the corrosion allowance (which is a part of wall thickness calculation in P.M.S)
After these 4 steps we are going to calculate the wall thickness according to the paragraph 304.1.1 of standard ASME B31.3)

My questions are as follow:

1-For generating the MSD how we should select the material? I have reviewed a lot of standards and specs but I could not find what I am looking for. I am really interested to have a reference for selecting the materials in this regards).
2-How we should calculate the corrosion rate in Normal condition (without CO2)?
3-I am looking for a few solved examples for both, with CO2 and without CO2.
4-Please let me know if I am wrong, and also please advise me.
Best regards,